Woow this is a really interesting interpretation of the word 'blank' from the theme! I'm really impressed you managed to make this much in such a short time! I find this to be a really fun and refreshing way to control where blocks land.
I found that it is a bit difficult to control where the blocks land because they fall rather quickly after they spawn. Also, sometimes I can't see where it is before it starts to fall and so I won't know what type of block will land or where it will land.
But when the bricks land the way I want them then it is really satisfying. I feel quite like a pro when I manage to land it so that it is right above the players head haha.
I think this idea has a lot of potential! Maybe it would be interesting to make it into a co-op two player game where one controls the character and the other controls the tetris blocks? Just an idea :))
I never managed to do it, but do you get points when filling up an entire row?